/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.training.exercises.common.utils;

/** Exception denoting a missing solution (results in tests verifying the solution instead). */
public class MissingSolutionException extends Exception {
    /** Create new exception. */
    public MissingSolutionException() {}

    /** Determine if the root cause of a failure is a MissingSolutionException. */
    public static boolean ultimateCauseIsMissingSolution(Throwable e) {
        while (e != null) {
            if (e instanceof MissingSolutionException) {
                return true;
            } else {
                e = e.getCause();
            }
        }
        return false;
    }
}
